From: Rajendra Nayak <rnayak@codeaurora.org>
To: Bjorn Andersson <bjorn.andersson@linaro.org>,
Andy Gross <agross@kernel.org>,
Ulf Hansson <ulf.hansson@linaro.org>,
Stephen Boyd <swboyd@chromium.org>,
Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RESEND PATCH 2/2] soc: qcom: rpmhpd: Make power_on actually enable the domain
Date: Wed, 14 Jul 2021 14:52:46 +0530 [thread overview]
Message-ID: <f3b61133-12d0-ba9d-e294-0dc019a9178f@codeaurora.org> (raw)
In-Reply-To: <20210703025449.2687201-1-bjorn.andersson@linaro.org>
On 7/3/2021 8:24 AM, Bjorn Andersson wrote:
> The general expectation is that powering on a power-domain should make
> the power domain deliver some power, and if a specific performace state
> is needed further requests has to be made.
>
> But in contrast with other power-domain implementations (e.g. rpmpd) the
> RPMh does not have an interface to enable the power, so the driver has
> to vote for a particular corner (performance level) in rpmh_power_on().
>
> But the corner is never initialized, so a typical request to simply
> enable the power domain would not actually turn on the hardware. Further
> more, when no more clients vote for a performance state (i.e. the
> aggregated vote is 0) the power domain would be turn off.
>
> Fix both of these issues by always voting for a corner with non-zero
> value, when the power domain is enabled.
>
> The tracking of the lowest non-zero corner is performed to handle the
> corner case if there's ever a domain with a non-zero lowest corner, in
> which case both rpmh_power_on() and rpmh_rpmhpd_set_performance_state()
> would be allowed to use this lowest corner.
>
> Fixes: 279b7e8a62cc ("soc: qcom: rpmhpd: Add RPMh power domain driver")
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Did some testing on sc7180 and sc7280 devices, no regressions seen,
Reviewed-by: Rajendra Nayak <rnayak@codeaurora.org>
Tested-by: Rajendra Nayak <rnayak@codeaurora.org>
> ---
>
> Resending because the hunk in rpmhpd_update_level_mapping() was left in the
> index.
>
> drivers/soc/qcom/rpmhpd.c | 18 ++++++++++++++----
> 1 file changed, 14 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/soc/qcom/rpmhpd.c b/drivers/soc/qcom/rpmhpd.c
> index fa209b479ab3..76ea6b053ef0 100644
> --- a/drivers/soc/qcom/rpmhpd.c
> +++ b/drivers/soc/qcom/rpmhpd.c
> @@ -30,6 +30,7 @@
> * @active_only: True if it represents an Active only peer
> * @corner: current corner
> * @active_corner: current active corner
> + * @enable_corner: lowest non-zero corner
> * @level: An array of level (vlvl) to corner (hlvl) mappings
> * derived from cmd-db
> * @level_count: Number of levels supported by the power domain. max
> @@ -47,6 +48,7 @@ struct rpmhpd {
> const bool active_only;
> unsigned int corner;
> unsigned int active_corner;
> + unsigned int enable_corner;
> u32 level[RPMH_ARC_MAX_LEVELS];
> size_t level_count;
> bool enabled;
> @@ -385,13 +387,13 @@ static int rpmhpd_aggregate_corner(struct rpmhpd *pd, unsigned int corner)
> static int rpmhpd_power_on(struct generic_pm_domain *domain)
> {
> struct rpmhpd *pd = domain_to_rpmhpd(domain);
> - int ret = 0;
> + unsigned int corner;
> + int ret;
>
> mutex_lock(&rpmhpd_lock);
>
> - if (pd->corner)
> - ret = rpmhpd_aggregate_corner(pd, pd->corner);
> -
> + corner = max(pd->corner, pd->enable_corner);
> + ret = rpmhpd_aggregate_corner(pd, corner);
> if (!ret)
> pd->enabled = true;
>
> @@ -436,6 +438,10 @@ static int rpmhpd_set_performance_state(struct generic_pm_domain *domain,
> i--;
>
> if (pd->enabled) {
> + /* Ensure that the domain isn't turn off */
> + if (i < pd->enable_corner)
> + i = pd->enable_corner;
> +
> ret = rpmhpd_aggregate_corner(pd, i);
> if (ret)
> goto out;
> @@ -472,6 +478,10 @@ static int rpmhpd_update_level_mapping(struct rpmhpd *rpmhpd)
> for (i = 0; i < rpmhpd->level_count; i++) {
> rpmhpd->level[i] = buf[i];
>
> + /* Remember the first non-zero corner */
> + if (!rpmhpd->enable_corner)
> + rpmhpd->enable_corner = i;
> +
> /*
> * The AUX data may be zero padded. These 0 valued entries at
> * the end of the map must be ignored.
>
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
next prev parent reply other threads:[~2021-07-14 9:23 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-03 0:54 [PATCH 0/2] soc: qcom: rpmhpd: Improve rpmhpd enable handling Bjorn Andersson
2021-07-03 0:54 ` [PATCH 1/2] soc: qcom: rpmhpd: Use corner in power_off Bjorn Andersson
2021-07-05 4:26 ` Rajendra Nayak
2021-07-05 5:06 ` Bjorn Andersson
2021-07-05 5:40 ` Rajendra Nayak
2021-07-07 4:49 ` Bjorn Andersson
2021-07-07 6:31 ` Rajendra Nayak
2021-07-07 15:48 ` Bjorn Andersson
2021-07-07 16:58 ` Dmitry Baryshkov
2021-07-08 0:21 ` Stephen Boyd
2021-07-08 4:35 ` Bjorn Andersson
2021-07-08 5:03 ` Rajendra Nayak
2021-07-08 6:51 ` Stephen Boyd
2021-07-15 10:40 ` Sibi Sankar
2021-07-03 0:54 ` [PATCH 2/2] soc: qcom: rpmhpd: Make power_on actually enable the domain Bjorn Andersson
2021-07-03 2:54 ` [RESEND PATCH " Bjorn Andersson
2021-07-08 0:23 ` Stephen Boyd
2021-07-08 0:25 ` Stephen Boyd
2021-07-14 9:22 ` Rajendra Nayak [this message]
2021-07-15 12:16 ` Sibi Sankar
2021-07-15 12:24 ` Rajendra Nayak
2021-08-12 13:21 ` Dmitry Baryshkov
2021-08-13 9:45 ` Ulf Hansson
2021-07-05 12:55 ` [PATCH 0/2] soc: qcom: rpmhpd: Improve rpmhpd enable handling Ulf Hansson
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